Method and apparatus for treating ores



Jan. 0 1925. 1,523,550

R. L. LLOYD METHOD AND APPARATUS FOR TREATING ORES Filed April 28, 1922 2 Sheets-Sheet 1 R. L.- LLOYD METHOD AND APPARATUS FOR TREATING ORES Filed April 28. 1922 2 Sheets-Sheet 2 Patented Jan. 20, 1925, r UNITED STATES PATENT OFFICE.

RICHARD L. LLOYD, OF NEW YORK. N. Y., ABSIGNOR. BY MESNE ABSIGNHENTQ'TO DWIGHT & LLOYD BIN'IERING COMPANY, INC., 01? NEW YORK, N. Y., A CORPORA- TION OF DELAWARE.

METHOD AND APPARATUS FOR TREATING DRES- Applicatlon filed Apr-1128, 1922. Serial No. 557,048.

T nllw'lmmit may concern. known construction, where the combustible Be it known that I, Brennan L. LLOYD, content of the charges in the carriers 3 is citizen of the United States, residing at set on fire at the upper exposed surfaces New York. in the county of New York and of said charges. After this the carriers pass 5 State of New York, have invented certain slowly over the open end of the air box 5 new and useful Improvements in Methods and the air currents produced by the fan 6 and A paratus for Treating Ores, of which cause internal combustion to be carried on the following is a specification, reference bethroughout the entire body of the charge in ing had therein to the accompanying draweach carrier 3, sintering it and putting it 0 i into desirable condition for subsequent treathfy invention relates to a method of treatment, as for instance, in a metal-reducing ing fine ores and other substances capable furnace. The carriers 3 successively disof being sintered, and to apparatus for charge their contents, after they have been acterlstlcs pointed out in the following During the sintermg operation the particles specification. of ore or other metalliferous substance with In the drawings: which the carriers have been filled become Fig. 1 is a view in side elevation of the more or less agglomerated, so that the maapparatus, terial dischar at the delivery end of the Fig. 2 is a view in plan of the apparatus apparatus consists of particles of porous shown in Fig. 1. smtered material varying in size from fine Fig. 3 is a sectional view showing the de grains to cakes or masses approximating in livery of the materials to the sintering size the chamber of the carrier 3. h rth, This material, the product of the appara- 25 Referring to the drawings by numerals, tus 2, is delivered to a screen 13 which 2 represents a sintering apparatus of a ty e separates the larger particles of sintered ma- 30 known to the trade as the Dwight & Lloyd terial and delivers them to a conveyor 14, sintering machine. Patents 1,027,084 and while the finer material that passes through 1,027,110 of May 21, 1912, to Dwight & the screen is delivered to a second screen 30 Lloyd Metallurgical Company, illustrate 15. When the material treated in the apand describe such apparatus, and reference paratus 2 is to be passed to a blast furnace is made thereto for details of construction for further treatment the screen 13 may be not herein specifically illustrated and deof half inch mesh. The mesh of the screen scribed. For the purposes of this invention 15 may be of th of an inch or smaller so 35 it is only necessary to refer to the following that all the material from the machine 2 be- 40 top of an air box in which the pressure is arranged to deliver its contents to t parts. A series of small individual ore tween 4th of an inch and a half inch in 00 carriers 3 are provlded which are adapted Size Wlll be delivered to the conveyor 16. to be arranged end to end and moved, as This conveyor delivers to an elevator 18 by drive mechanism designated 4,.aer ss the which in turn discharges into a holpper 9 e carreduced and suction created by a fan 6. rlers 3 in advance of the delivery of ma- This induces currents of air to pass through terial from the hopper 7. the fine ore with which the carriers 3 are In operating sintering machines such as filled. from a hopper 7, which in turn is hown hereln it is found advantageous to kept supplied from a storage bin 8 by any cover the grates 11 of the carriers 3 with a.

suitable ore handling mechanism. The ore layer of material inert as to atmospheric or other metalliferous material delivered combustion in order that the grates may be from the hopper 7 is in a pulverulent or somewhat protected against the intense heat finely subdivided condition and carries a incident to the si'ntering o eration and the content that may be ignited and burned in fine material being sinte be thereby prethe open air, to effect the sintering opervented from being drawn through the grates ation, in a well known manner. The car- 11 by the air blast. The finer products of rieis 3 after being filled are moved past an the sintering machine, of a size separated igniter (not shown) of any suitable or by the screens 13 and 15, as described, are

found to be well adapted for use as the covering for the grates 11. The delivery opening of the hopper 9 is so restricted in size that only a thin layer 10, say of an inch in depth, is delivered upon the grates 11 as they successively pass beneath the hopper, and upon this layer the fine material from the hopper 7 is deposited.

The material that passes through the screen 15, say ztth of an inch and under in size, is too fine to be used as a grate covering, since it would pass freely through the grate openings. It is, however. valuable material, since it carries its content of metal and is in porous condition due to having been sintered. thus fitting it for subs uent treatment. The individual particl ow.- ever, are too fine for use in a blast furnace. I therefore deliver the final material that passes through the screen 15 to a collecting hopper 17 which in turn delivers to a conveyor 19. This conveyor, which may be of simple or com lex construction and arrangement. is a apted to deliver to the hopper where this finest portion of the product of the sintering machine is mixed with the raw ore and is a second time passed through the 'sintering machine 2 along with such raw ore, where it becomes agglomerated with other particles and masses during the sintering operation. It is to be understood that the use of the phrase raw ore is not to be taken literally. for, while raw ore will be fed, in certain operations. from the char ing bin 8 to the feeding hopper 7. ore w ich has been subjected to preliminary treatment, and materials other than raw ore, will be handled according to my method in certain operations.

By this method of procedure the entire product ofthe sintering machine is utilized. for, as will be understood, the particles constituting the layer 10. covering the grates. adhere and aglomerate with the sintered charges in the carriers 3. In practice it has been found that about 75% of the product of the machine will be separated by the screen 13 and delivered to the conveyor 14; about 10% of the total product is taken out by the screen 15 to be utilized as the covering for the grate; and the remainder, approximately 15%, is of such fine character as to necessitate its being passed through the sintering machine a second time to be further agglomerated. These proportions will, however, vary with the material being treated and also with the mesh of the screens 13 and 15. It will be understood that if the quantity of the material taken out by the screen 15 is not sufiicient to form a proper protective covering for the grates 11, it may be supplemented by other suitable material fed to the hopper 9. The invention herein described is not to series of movable carriers be limited in its use to the specific a paratus represented in the drawing an herein described, as that is employed in this cas merely for the purpose of disclosing one practical embodiment of the invention.

What I claim is:

1 The herein described method of treating fine sinterable material consists in smtering the mass, then grading the. smtered product according to the sizes of the particles thereof, using the material of one grade as a covering for the material holders during the sintering process. delivering the material of a finer grade to the material to be treated so it passes a through the sintering operation and conducting away the coarser material later treatment.

2. The herein described method of treat ing sinterable ore which consists in passing it through a sintering machine, ding the product of such machine acco ng to the size of the masses and particles deliv-' ered from the machine, separating the coarser masses and particles for later treatment. delivering the particles of intermediate size to the sintering mabhine to form a protective layer for the ates thereof, and delivering the finer partic es'to the machine along with the original material to be sintered.

3. The herein described method of treating sinterable ore which consists in sintering the .original ore in a continuously operating machine, taking out of the pro not of the machine masses and particles of approximately a half inch in size and upward for later treatment as sinter material, taking out of the remaining product of the machine particles to approximately 54th of an inch in size and less and using as a protective layer for the grates of the sintering machine, and returning the remainder of the product to the material to be passed through the machine to be sintered.

4. In sintering apparatus, the combina tion of a sintering machine, a grader to which the product of the machine is delivercd. means for conducting away the coarser articles of the masses sepa out by tie grader for later treatment, conveying means for taking the particles of intermediate size delivered the ader to the head of the machine and elivermg them upon the grates thereof as a protective layer, and conveyin means for receivin and delivering the ner particles from tie grader to the charging end of the machine.

5. In a sintering apparatus, the combination of a sintering machine, having a for the material to be sintered, a charge hopper ands ho 4 per for delivering a protective layer to t e grates of the machine, before the charges second time are delivered thereon, a grading screen for receiving the product of the machine, means for conveying away the coarser masses and particles taken out bythe grading screen for later treatment, conveying means for separated by thegrading screen and delivering to the hopper that delivers the rotective layer to the grates of the carriers, and conveying means for delivering the finer particles separated by the grading screens to the charging hopper of the machine.

6. Thecherein described method of treating sinterahle material which consists in sintering the original material. grading the sintered product into different sizes, using material of one size to coverthe material holders during sintering. and subjecting the material sintering operation.

7. The herein described method of treating sinterable material which consists in sintering the original material, grading the sintered product into different sizes, using material of one size to cover the material holders during sintering. and delivering the material of another size to the original material to be treated so as to subject it a second time to the sintering operation.

8. The herein described method of treating sinterable material which consists in sintering the original material, grading the sintered product into different sizes, using material of one size to cover the material holders during sintering, and subjecting the material of a smaller size to a second sintering operation.

9. The herein described method of treating sinterable material which consists in sintering the original material, grading the sintered product into difi'erent sizes, using material of one size to cover the material holders during sintering. and delivering the material of a smaller size to the original material to be treated so as to subject it a. second time to the sintering operation.

10. The herein described'method of treating sinterable material which consists in sintering the original material, grading the sintered product into different sizes, using material of one size to cover'the material holders during sintering, subjecting the material of another size to a second sintering operation, and carrying away a third size of the material for later treatment.

ll. 'I'hc herein described method of treating sinterahle material which consists in sintering the original material, grading the sintered product into different sizes, using material of one size to cover the material holders during sintering, delivering the material of another size to the original material to be treated so as to subject it a second time to the sintering operation, and

of intermediate size grading mechanism to of another size to a second them to the grading mechanism to carrying away a third size of the material for later treatment.

12. The herein described method of treating sinterahle material which consists in sintering the original material, grading the sintered product into difl'erent sizes, using the material of an intermediate size to cover the material holders during sintering, de-

livering the material of a finer'size to the original material to be treated so as to sub jcct it a second time to thesintering operation. and carrying away the larger sizes of material for later treatment.

13. In apparatus of the class described. the combination of a sintering mechanism. which the product of the sintering inechanism is delivered. conveyor means for delivering the material of an intermediate size to the'grates of'the sintering apparatus to form a protective layer, and conveyor means receiving the finer sizes from the grader and delivering charging end of the machine.

14. In apparatus of the class d scribed, the com'bination of sintering machines, a plurality of grading mechanisms to which the product of the sintering mechanism is delivered, conveyor means to deliver the material from one grading mechanism to the sintering grates as a' protective layer, and conveyor means to deliver the product of another grading mechanism to the charging end of the machine.

15. In apparatus of the class described, the combination .of sintering mechanism, which the product of the sintering mechanism is delivered, means for carrying away larger sizes of the mass, graded out for later treatment." conveyor means for delivering the material of an intermediate size to the grates of the sintering apparatus to form a protective layer. and conveyor means receiving the finer sizes from the grader and delivering them to the charging end of the machine.

16. In apparatus of the class described, the combination of sintering mechanism, a plurality of screens to which the product of the sintering mechanism is delivered. conveyor means to deliver the material from one screen to the sintering grates as a protective layer, and conveyor means to deliver the product of another screen to the charging end of the machine.

17. In apparatus of the class described. the combination of sintering mechanism, a plurality of screens to which the product of the sintering mechanism is delivered. means for carrying away the larger unscreened particles of the mass for later treatment. conveyor means to deliver the material from one screen to the sintering grates as a protective layer, and conveyor means to deliver the product of another screen to the charging end of III the machine. 1

of the sintering mechanism is delivered,

18. In apparatus ofthe class described, the combination of 'sintering mechanism, means for delivering 'origmal material thereto, grading mechanism to which the product of the sintering mechanism is delivered, conveyor means to deliver sintered material of one size to the sintering grates as a protective layer, and conveyor'means for delivering material of another size separated by the grader to the original material delivering means.

19. In apparatus of the class described, the combination of sintering mechanism, grading mechanism to which the product means for conducting away for later treatment the large nnscreened particles of the mass separated out by the grader, conveyor means to deliver the intermediate sizes of sintered material to the sintering grates. as a protective layer, and conveyor means for delivering the finer sizes of material to the charging end of the material for a second sintering operation.

In testimony whereof, I ture.

RICHARD L. LLOYD.

aflix my signa- 25 18. In apparatus of the class described, the combination of sintering mechanism, means for delivering original material thereto, grading mechanism to which the product of the sintering mechanism is delivered, conveyor means to deliver sintered material of one size to the sintering grates as a protective layer, and conveyor means for delivering material of another size I separated by the grader to the original material delivering means.

19. In apparatus of the class described, the combination of sintering mechanism, grading mechanism to which the product RICHARD L. LLOYD.

. V DISOLAI M E R 1,523,550.Richard L. Lloyd, New York, N. Y. Mlrrnon Am APPARATUS FOR TREATING Ones.

Patent dated January 20, 1925.

Disclaimer filed July 11,

1925, by the patentee and the assignee, Dwight (fi' Lloyd Sz'ntering Compemy Inc.

Hereby enters this disclaimer to that part of the claims and specification which is in the following words:

1, The herein described method of treating fine sinterable material consists in sintering the mass, then grading the sintered product according to the sizes of the particles thereof, using the material of one grade as a covering for the material holders during the sintering process, delivering the material of a finer grade to the material to be treated so it passes a second time through the sintering operation and conducting awa the coarser material for later treatment.

2. The herein described method of treating sinterable ore which consists in passing it through a sintering machine. grading the product of such machine according to the size of the masses and particles delivered from the machine, separating the coarser masses and particles for later treatment, delivering the particles of intermediate size to the sintering machine to form a protective layer for the grates thereof,'and delivering the finer particles to the machine along with the original material to be sintered.

6. The herein described method of treating sinterable material which consists in sintering the original material. grading the sintered product into different sizes, using material of one size to cover the material holders during sintering, and subjecting the material of another size to a second sintering operation.

7. The herein described method of treating sinterable material which consists in sintering the original material, grading the sintered product into different sizes, using material of one size to cover the material holders during sinterin and delivering the material of another size to the original material to be treate so as to subject it a. second time to the sintering operation.

8. The herein described method of treating sinterable material which consists in sintering the original material, grading the sintered product into difi'erent sizes, using material of one size to cover the material holders during sintering, and

sub'ectin the material of a smaller size to a second sintering operation. e herein described method of treating sinterable material which consists in sintering the original material, grading the sintered product into different sizes. using material of one size to cover the material holders during sintering. sub ecting the materal of another size to a second sintering operation. and carrying away a third size of the material for later treatment.

[Oficial Gazette August 4, 1925.]

DISCLAIMER.

1,523,550.Riclzard L. Lloyd, New York, N. Y. Mnrnoo imp Armm'ros FOR TREATING Oars. Patentdated January 20, 1925. Disclaimer filed July 11, 1925, by the patentee and the assignee, Dwight ((2 Lloyd Sintering Company Hereby enters this disclaimer to that part of the claims and specification which is in the following words: n

1,The herein described method of treating fine sinterable material consists in aintering the mass, then grading the sintered product according to the sizes of the particles thereof, using the material of one grade as a covering for the material holders during the sintoriug process, delivering the material of a finer grade to the material to be treated so it passes a second time through the sintering operation and conducting away the coarser material for later treatment.

2. The herein described method of treating sinterable ore which consists in passing it through a sintering machine. grading the product of such machine according to the size of the masses and particles delivered from the machine, separating the coarser masses and particles for later treatment, delivering the particles of intermediate size to the sintering machine to form a protective layer for the grates thereof,'and delivering the finer particles to the machine along with the original material to be sintered.

6. The herein described method of treating sinterable material which consists in sintering the original material. q'radin; the sintered product into different sizes,

using material of one size to cover the material holders during sintering. and subjediing the material of another size to a second sintering operation.

7. The herein described method of treating sinterable material which consists in sintering the original material grading the sintered product into different sizes, using material of one size to cover the material holders during sinterin and delivering the material of another size to the original material to be treate so as to subject it a. second time to the sinterinp operation.

8'. The herein described method of treating sinterahle material which consists in sintering the original material, grading the sintered product into difi'erent sizes, using material of one size to cover the material holders during sintering, and subjectin the material of a smaller size to a second sinteringz operation.

10. 0 herein described method of treating sinterable material which consists in sintering the original material, grading the sintered product into different sizes using material of one size to cover the material holders during sintering. subjecting the materal of another size to a second sintering operation. and carrying away a third'size of the material for later treatment.

[Oficial Gazette Aagust 4, 1925. 

